Process of making waterproof products



LESTER IKIESCBA'UN, OF CHICAGO, ILLINOIS.

lilo Drawing.

This invention is in part issued Patent No.

on my May 30th, 1922 and of application Serial cember 27th, 1921. Heretofore,

issued to me FROCESS OF MAKING WATEBPtm PRODUCTS.

Application filed January an improvement 1,417,840, dated in part a continuation No. 525,100 filed De- I have had Patent No. 1,536,399

dated May 5th, 1925 and have co-pending application Serial No. 582,303 filed August 16th, 1922, in which product in an a bituminous or pitchy emulsified form or otherwise non-adhesive condition, is mixed with pulp before or during the a paper forming felting of the pulp on apparatus, or the emulsion applied to the surface of the wet web during formation. By means of my prior processes referred to, a paper or other sheet may be formed on paper which there is incorporated bitumen,

forming apparatus in which becomes coalesced into continuous films when dry.

More particularly,

my prior processes referred to may be carried out as follows:

I makea suitable non-adhesive bituminous emulsion of, for example, water, other bitumen, the internal phase and clay and asphalt or the bitumen forms colloidal in which the water the external phase of the emulsion.

This emulsion may brous pulp in the usual be mixed with the libeater and the mixture flowed over a paper machine to form a web or sheet, or the coating over the driers, the

the bitumen allowed Not only may ordinary paper for example, building paper,

or the like, but paper suitable for as, floorlng emulsion applied as a to the wet web. As the sheet passes water is removed and to coalesce.

be formed, roofing,

box board or other forms of containers may be produced.

As is well known to those skilled in the art, the amount of waste paper, either 1n the form of boxes, containers in the aggregate forms a huge volume.

broke from paper formed by addition, the

or otherwise, In

the process above described, itself constitutes a substantial amount.

The object of the present invention is to re-use the material contained in the old boxes or containers or the broke wise waste paper produced by processes and contalning asphalt pitchy binder, ucts.

or otherthe above or other to form new waterproof prodlhis is accomplished by suitably treating the waste products referred to and reusing them in the heaters, either alone 13, 1925. Serial No, 2,787.

or mixed with fresh stock, to form such waterproof products.

the

In re-using such Waste materials, method of treatment will depend considerably upon the amount and character of waterproof material contained in the waste. Where the amount of bituminous material is not too large, edective recovery can be brought about by charging the heaters in the usual way and employing water heated to approximately the melting point of the bituminous material contained in the charge. The effect of the hot water is to soften the bituminous material so that under the action of the beater roll, the fibres become disengaged and freed from contact. It is advantageous in carrying out the beating operation to bring the roll down upon the bed plate to a light brush so as to avoid cutting the fibres and rather separate the matted stock. The heating operation otherwise is carried on in the usual manner until the stock is freed and ready to be used on the machine. if desired, the stock, after sucient treatment may be washed in the usual washer so as to remove as much of the bituminous matter as has been freed by the beating action from the stock.

When the waste paper is composed of hard stock and where the amount of asphalt is relatively eat, the above 0 eration is advantageous y supplemented y introducing into the beater a small amount of alkali soda ash, silicate of soda, or equivalent material, which assists the disintegrating action of the beater operation. Where treatment of the above character is employed, there should be-added to the stock before running upon the machine, suficient alum to neutralize the alkali and to precipitate the disengaged asphalted articles upon the fibres. The effect of this atter treatment is to produce an envelope or protective coating of bulky gelatinous precipitate about the asphaltic particles. lln any event, however, a desirable feature but not always necessary, is to recipitate or flocculate the asphaltic partic es upon the fibres by the use of alum or equivalent flocculating agent, whether alkali is used or not. This renders the material suficiently non-sticky so that it may be run over the paper machine in combination with other stocks without gumming up the apparatus. When the sheet is formed in the usual way, the water is removed and the No. "L":

protective coating brolren during the drying of the sheet.

Another method of ire-using the waste products above referred to is as follows:

To the asphalted stock in the heaters is added a relatively small amount of oleic acid, sulphonated castor oil, or sulphonic acid salts, such as possess the properties of acting upon and dissolving the asphalt in thestock. After a sufficient period of treat ment in the heaters with the above agents, an alkali may be added, resulting in the emulsification of the bituminous material and its rapid disengagement from the librous stools in the form of discrete particles. This treatment renders the recovered asphalt non-adhesive, so that upon subsequent treatment with alum and precipitation upon the fibres, the stoclr can be run over the paper machine in the usual manner. The amount of the above re-agent will vary with the character of the stock and the amount of asphalt contained therein, but ordinarily about 2% of emulsifying base, will serve to carry out the above operation.

lln addition the will be understood that other emulsifying bases may be employed, particularly those having the property of miscibility with both asphalt and watcra llhe distinguishing characteristics of the process described herein, over the process described in my issued United States Patent 1,417,840 is that that patent deals primarily with waste saturated felt, which felt lit was saturated, impregnated or coated with bituminous material, by immersion, after it had been formed into a felted sheet and dried, as is customary inthe manufacture of roofing, while the present invention deals primarily with the recovery of waste fibrous stock in which the bituminous waterproofing material with an emulsifying agent was incorporated with the fibrous stock simultaneous'l with the felting thereof while same was wet.

Such material as isreferred to in the present invention, may have bitumen contained throughout the entire body of the sheet, or board, and in quantities varying from that which produce a minor water repellant action which fully saturates the sheet, or this Waste may comprise the prodnot of a multi-cylinder board machine in which only one or more of the plies, preferably the inner plies, contain heavily asphalted stock while the adjoining plies usually four or five, contain untreated or as; phaltic stock. In the latter case the recovery takes place in the presence of a largely predominating amount of untreated stock; the asphalt usually comprising less than 20% by weight of the entire sheet. It will be apparent that there is a difference between stock of the character treated by the present invention from board or waste,

above substances, it

present invention, and that of waste satu rated felt, in that the waste saturated felt always contains a prepondering amount of asphaltic materials usually of fairly soft nature, whereas the material treated by the present invention presents a wide range of constitution as regards amounts of bitumen present, the nature of the bitumen, and the presence of the emulsifying agent originally incorporated in the sheet,

it has been found in actual practice that the stock prepared in accordance with the multicylindcii is particularly adapted for application to the inner plies of multicylinder sheet generally without; the addition of fresh stock. This is true for'thc reason that such stock is generally beaten quite short as a result of the recovery op eration, and also on account of its contained asphalt, is slow and produces a dense inner ply particularl T adaptable for recei ing additional quantities of asphalt either in the form of a film application, in admixture with the stock.

I claim as my" invention:

1. A. process of recovering waste fibrous products having incorporated therein a bituminous waterproofing binder with a dis pcrsing agent simultaneously with the fol"- ing, comprising in subjecting said waterproof fibrous products in an aqueous vehicle to beater action at an elevated temperature approximating the melting point of the binder contained in the waste fibrous stock, causing separation of the fibres precipitating the bituminous material on the separated fibres to render some non-sticky, and felting the stock on a paper machine.

2. A process of recovering waste fibrous products having incorporated therein a bituniinous waterproofing binder with a dispersing agent simultaneously with the felting, comprising subjecting said waterproof fibrous products in an aqueous vehicle to beater action at an elevated temperature approximating the melting point of the binder contained in the waste fibrous stock, and adding a flocculating agent to precipitate the binder upon the fibres.

3. A process of recovering waste fibrous products having incorporated therein a bituminous waterproofing binder comprising subjecting said waterproofed fibrous prodnets in an aqueous vehicle to beater action at an elevated temperature approximating the melting point of the binder contained in the fibrous stock causing separation of the fibres from said bituminous material, precipitating the disengaged bitumen on the separated fibres, producing an envelope and felting the stock on a paper machine.

4, A process of recovering waste fibrous products having incorporated therein a bituminous waterproofing binder comprising muse-e7 subjecting seitl waterproofei fibrous prodnets in an aqueous vehicle to beater action at an elevated temperature approximating the melting point of the-binder contained ill in the fibrous stock to separate the fibres and bituminous meteriel,v adding fresh fibrous stock to the beater precipitating the disengaged bituminous particles on the separated fibres, rendering the mixture noneclhesive enfl felting the mixture.

5. A process of recovering Waste fibrous roducts having incorporated therein a bituminous Waterproofing binder with (lispersing agent simultaneously with the felting, comprising subjecting sefl Waterproofed fibrous products in an e'queous vehicle to beater action at an elevetedi temperature approximatin the melting point of the binder conteine vin thefibrous stock, in

the presence of an alkali, adding it metallic salt to produce an enveloping coating end felting the stock on e paper machine.

LESTER KlRSCHBli-Aml. 

